Leases (Summary of Lease Expense Components) (Details) - Southern California Edison - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Total lease cost	$ 802	$ 1,876
PPA Operating Leases
Lessee, Lease, Description [Line Items]
Lease cost	38	98
Finance lease cost	1	1
Variable lease cost	751	1,742
Total lease cost	790	1,841
Other operating leases cost
Lessee, Lease, Description [Line Items]
Lease cost	$ 12	$ 35

Finance Lease, Right-of-Use Asset, Amortization and Interest Expense

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- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-SubTopic 20
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+ References

No definition available.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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